Rotary grinder



April 3, 1928. 1,664,693

J. H. LITTLER ROTARY GRINDER Filed Jan. 29, 1925 4 Sheets-Sheet 1 April 3, 1928. 1,664,693

J. H. LITTLER ROTARY GRINDER Filed Jan. 29, 1925 4 Sheets-Sheet 3 April 3, 1928. 1,664,693

J. H. LITTLER ROTARY GRINDER Filed Jan. 29, 1925 4 h e s-Sheet 4 Z Z 7 3 4 4 J Patented Apr. 3, 1928.

UNITED STATES PATENT OFFICE.

JAMES HENRY LITTLER, F MANLIUS, NEW YORK, ASSIGNOR '10 S. CHENEY & SON, OF

MANLIUS, NEW YORK, A CORPORATION OF NEW YORK.

ROTARY Application filed January This invention relates to a grinding machine preferably of the hand Operated type adapted to be clamped upon a bench or other suitable support for grinding various kinds of articles such as the poppet valves for internal combustion engines, drill points, shears, chisels and analogous objects and also involving the use of a trueing device by which one of the end faces of the grinder may be kept in a perfectly fiat plane at right angles to the axis of rotation.

The main object is to provide the machine with suitable guide holders for the various kinds of work to be operated upon and also to enable the trueing device to be operated at will for trueing one of the end faces of the grinder when desired, all of said work holders and trueing device being installed on the machine as a unitary part thereof and each having a particular relation to the grinder.

One of the specific objects is to enable the valve holder to be adjusted to different angles to conform to the angle of the seating face of the valve with the axis of the valve stem.

Another object is to provide the chuck for receiving and holding the valve stem with double conical ends cooperatin with opposite end thrust bearings where y the longitudinally operated chuck may be compressed upon the valve stem throughout the major portion of its length and thereby reduce the liability of vibration of the valve during the refacing process. 1

Another specific object is to provide the drill holder with means for centering, holding and adjusting the drill at the proper angle to the grinder for producing the desired angular cutting face.

Other objects and uses relating to specific parts of the machine will be brought out in the following description.

In the drawings Figure 1 is a perspective view of a grinding machine embodying the various features of this invention.

Figure 2 is an enlarged horizontal sectional view taken on line 2--2 Figure 1.

Figure 3 is an enlarged vertical sectional view taken on line 3-3 Figure 1.

Figure 4 is a horizontal detail sectional view taken in the plane of line 44 Figure 3.

Figure 5 is a detail vertical sectional view taken in the plane of line 5--5 Figure 2.

GRINDER.

29, 1925. Serial m. 5,603.

Figure 6 is an enlarged vertical sectional View taken on line 66 Fi re 1.

Figure 7 is a detail sectlonal view taken in the plane of line 77 Figure 2.

As illustrated, this invention comprises an upright main supporting frame 1-- hav- 1ng vertically spaced clamping arms -2 and 3- for receiving between them. a portion of a bench or table top upon which the machine is adapted to be mounted, the arms -2 bemg arranged in horizontally spaced relation for engagement with the upper face of the bench or table top while the lower arm 3- is disposed in a vertical plane substantially midway between the arms 2- and is provided with a threaded opening 4 for receiving a vertically adjustable clamping screw 5- havin a head 6 adapted to engage the underslde of the bench or table top and together with the arms -2- constitut-ing means by which the frame may be clamped to or removed from the bench or table.

The frame -1- is preferably composed of sections -7 and -8 having relatively large circular chambers -9-- in their adjacent faces to form a gear housing, the sectlons -7-- and -8- being secured together face to face by clamping bolts -10.

The arms 2 and 3 are preferably formed upon the section -7- to permit said section to remain upon the bench ready for use, while the section -8-- maybe removed by simply loosening the clamping bolts 10- and such other parts of the machine asma-y interfere with said removal when adjusted for use.

A horizontal operating shaft 11- is journale'd in suitable bearings -12- in the frame 1- and is provided on its outer end with a hand crank -13- by which it may be rotated.

A relatively large gear -14- is secured t the shaft 12- within the chamber 9- and is adapted to mesh with a relatively small pinion 15 on the intermediate portion of the horizontal shaft -16- which is journale'd at suitable bearings 17- in the upper portion of the frame -1- parallel with the operating shaft -11- and is therefore adapted to be driven at a relatively high rate of speed.

A cylindrical grinder --18- of carborundum, emery or any other suitable material is secured to one end of the shaft -16- by grinder -18-- against movement in one di-' I rection.

The other end of the shaft 16- is provided with a collar 22 tight thereon for engaging the adjacent end of the bearing -17 to hold the shaft -16 and grmder -18- against endwise movement in the opposite direction.

The object of the recess -21- in the outer end of the grinder -18- is to permit the clamping collar 19 to he wholly within said end face so that certain classes of work to be ground or polished may be moved across the entire area of said end face.

The pinion -15- is preferably formed in theshaft -16- as a unitary part thereof by simply cutting the teeth in its perlphery to mesh with the gear 14 A bracket -23- is adjustably secured by bolts -23- and slots -23" to the outer end face of section 7- of the frame and is provided with a split journal bearing -21- in which is journaled a rotary upright shaft -25- and is also provided in its lower end with a gear chamber -26 and a laterally offset bearing -27 for receiving respectively a worm gear 28- and a rotary shaft 29, said bracket and parts carried thereby being adjustable about the axis of the shaft 29- to permit the work, as a to be adjusted toward and from the axis of grinders of different diameters, or as the periphery of the grinder 18- is worn away.

The worm ear 28- is secured to the lower reduced end of the upright shaft 25, said reduced end being extended downwardly and journaled in a suitable openin in a bushing 29'-- which is screwe into the lower end of the gear chamber -26- to form an end thrust bearing for the lower end of the hub of the gear -28- and'thereby to hold said gear and shaft -25- against downward movement relatively to the bracket -23.

The shaft 29- extends horizontally parallel with the grinder shaft 11- and to opposite sides of the worm gear --28-, and also across the periphery of the relatively large gear 14- where it is provided with a relatively small pinion 30-- meshing with said gear to receive rota1y motion therefrom and whereby the shaft -29- will be driven at a relatively high rate of speed as compared with that of the shaft The intermediate portion of the shaft 29 ls'provided with a gear worm 31 meshing with the gear 28 for driving the upright shaft -25- at a considerably lower rate of speed than that of the shaft -29 having a purpose presently described.

A horizontal bearing -32- having an offset upright hub 33, is supported upon the upper end of the bearing --24 of the bracket --23-- and also upon the upper end of the shaft -25 so as to extend partially across the face of the rotary grinder --18- and is adjustable angularly about the axis of the upright shaft -25- to different an gles relatively to the axis of the a grinder v This horizontal bearing -32 is ada ted to receive and support a rotary work ho der -35- which comprises a sleeve --36- and a collet chuck -37--, the latter being adapted to receive and support the work such, for example, as the stem a of a poppet valve --a-.

The sleeve 36-- is journaled in the hearing -32- for relative rotation therein and is provided intermediate its ends with a worm gear -38- formed by cutting the teeth in the periphery of the sleeve and ada ted to mesh with a gear worm 39 out o upper end of the upright shaft 25- Figure 5.

The chuck 37- preferably consists of tube split longitudinally through portions of its length from both ends and having each end tapered for engaging similarly tapered end thrust bearings 40 and 40'- at corresponding ends of the chuck, the tapered bearing 40 being preferably formed on the adjacent end of the sleeve -36- while the other tapered bearing -40 is movable axially within the sleeve and is adapted to be tightened and released for clamping and releasing the work by means of an adjusting screw 41- in the adjacent end of the sleeve. I

The axially adjustable bearing 40- and screw 41 are provided with registering'openings coaxial with the axis of the tubular chuck 35- to permit the stem of the valve to extend thereinto when the head of the valve at the opposite end of the bearing 32 is in position for grinding.

When it is desired to clamp the stem of the valve in the chuck 35 the screw -41- will be turned to force the movable bearing 40'- toward the other bearing -40 thereby causing both ends of the split collet or chuck 35 to be compressed tightly upon the valve stem to more firmly hold the valve against vibration during the grinding operation.

Reversing the direction of the rotation of the screw --4L1- will release the conical bearing '32- and thereby permit the jaws of the chuck -35- to open for releasing the valve stem and permitting the valve to be withdrawn after it has been properly ground.

The head of the screw 41 is provided with an annular groove 42 for receiving the peripheral portion of the head -43- of a stop screw 44- which is adjustable in a threaded boss 45 on the under side of the bearing 32 and is frictionally held in its adjusted position by a friction screw 46- in one side of the lug 45-.

The object of engaging the head 43 of the stop screw 44- in the grooved head of the screw 41 is to prevent accidental turning of said screw during the rotation of the work holder with the work therein particularly when the latter is engaged with the rotary grinder 18.

The work holder is arranged in such manner as to support the part of the work to be ground, as, for example, the valve head a in contact with the outer end face of the rotary grinder 18 in approximately the horizontal plane of the axis of said grinder so that when the grinder is rotated at a relatively high rate of speed the valve or other work held in the chuck 35 will be rotated at a relatively low rate of speed so as to produce a smooth finish on the work during one revolution of the work holder and at the same time reducing the liability of vibration of the work in the holder.

The angle of the seating faces of differ ent valves varies and it therefore becomes necessary to adjust the bearing 32 and work holder therein to different angles relatively to the axis of the grinder or rather relatively to the outer end face of the grinder, the angles of the valves being known and in order that the operator may set the work holder at the desired angle the periphery of the base of the upright hub 33- of the bearing --32- is graduated circumferentially at 47- to register with a fixed mark --48- on the adjacent upper end of the hub 24 Figure 3.

Tracing device.

In order that the seating face of the valve may be ground to true form and angle, it is necessary to keep the outer end face of the rotary grinder in a truly flat plane at right angles to its axis of rotation and for this purpose is provided a suitable trueing device consisting of a peripherally toothed trueing wheel 48 which is journaled in the upper bifurcated end of an upright lever -49- which is pivoted intermediate its ends at -50- to the upper bifurcated end of a rock arm -51-, the latter having its lower end pivoted at. .-52 to a supporting arm 53 Figures 1 and 6.

This supporting arm ---53- is provided with a split cap 54- which is seated over and upon the outer end of the bearing 27- to engage the corresponding outer end of the shaft -29 so that when the cap -54.- is firmly clamped to the bearing -27- it will hold the shaft -29 against outward endwise movement in case its direction of rotation should be reversed by reversing the direction of rotation of the grinding element from that required to produce the desired grinding effect upon the valve, it being understood that the contacting faces of the grinder and valve move in opposite directions during the grinding operation.

The other end of the shaft 29 opposite that which is engaged by the cap 54 is reduced to form a shoulder at the adjacent end of the pinion 30 for limiting the movement of the shaft in that direction during the regular grinding operation.

The lever 49 extends downwardly some distance beyond its pivot -50 and is provided with a threaded opening for receiving an adjusting screw 55- which is adapted to engage the rock arm 51- and thereby to force the trueing wheel 48 on the upper end of the lever into engagement with the adjacent face of the grinder for trueing purposes, said lever being provided with a handle -56 by which it, together with the rock arm -51, may be moved about the axis of the pivot 52 for moving the trueing wheel 48 across the outer end face of the grinder.

The pivot 52 is parallel with the axis of the grinder so that adjusting the lever 49- by means of the screw 55 to cause the trueing wheel 48 to contact with any one portion of the grinder and then moving the lever laterally about the axis of the pivot 52- will cause the outer end face of the grinder to be trued to a flat plane at right angles to its axis of rotation for producing a smooth finish of the face of the valve when the latter is rotated thereagainst.

Drill holder. Suitable means is provided for accurately grinding the points of drills, said means comprising in this instance a drill holder -58 Figures 1, 2 and 7, supported in an inclined plane at an angle to the outer end face of the grinder corresponding to the angle to which the point of the drill is to be ground, the upper face of the support 58- being provided with a V-shaped groove 59-- in which the drill is adapted to lie lengthwise with its point facing the grinder in such manner as to grind the portion of said point to the desired angle below the axis of the drill.

For this purpose the support -58 is provided near its end adjacent the grinder with a downwardly projecting pivotal stud 60 at substantially right angles to the base of the groove 59 and journaled in a suitable bearing 61- which forms a part of a supporting bracket -62 on the frame 1- and is inclined upwardly at an angle to and away from the adjacent end face of the rinder --18-- to support the drill at the esired angle relatively to the grinding face and at the same time to permit the support to be rocked by hand laterally about the axis of the pivotal stud -60 for imparting a circumfcrentially convex curvature to the portion of the drill point being ground. I

Durlng the grinding operation of the oint of the drill the latter may be rotated by hand in the groove -59- to present different portions of the drill point to the grinder with the assurance that all parts will be ground at a uniform angle and circumferential curvature.

Tn order to assure this uniform grinding of the point of the drill the opposite end of the drill is engaged by an 'ad'usting screw -63- which is engaged in a t readed aperture -58- in the outer upwardly offset end of the support --58- and is provided with ahandle --63 by which it may be rotated for axial adjustment according to the length of the drill.

The bracket 62- extends across the periphery of the grinder -18- opposite the work holder -35- and is provided at its inner end with a downwardly projecting arm -62- having a lengthwise slot 6 t for receiving a clamping bolt -65 which passes through a slot -66-- in an arm -67- on the frame section 8 said arm -67- being therefore stationary relatively to the frame while the bracket -62 may be adjusted vertically and horizontally and to different angles about the axis of the clamping bolt -65- and held in any of its adjusted positions by the tightening of said bolt.

The portion of the bracket -62-- which extends across the periphery of the grinder '18-- constitutes a work rest having a beveled upper face and may be adjusted to different angles relatively to the adjacent grinding face as may be required for grinding different kinds of work by simply adjusting the arm -62- vertically and horizontally as permitted by the slots -64- and -66- and then tightening the bracket in place by the clamping bolt -(55.

15 hem" holder.

The bracket 62- is provided at its in ner side with an upright extension 70- adjacent one of the end faces of the grinder -18- preferably opposite the drill holder -58-, said extension being provided'with a beveled upper face -71- disposed at an angle to the adjacent end face of the grinder corresponding to the angle at which the cutting edge of a shear blade is to be ground.

That is, the upper beveled face of the extension '70 forms a rest upon which the blade of the shears may be supported with its cutting edge extending across and agamst the adjacent end face of the grinder for grinding the cuttin edge of the shear blade to the desired beve orangle.

When grinding a shear blade, the bracket 62-- will be adjusted to bring the beveled face 7 1-- in a plane some distance above the axis of the grinder but below the top of the grinder thus permitting the use of the major portion of the adjacent end face grinder above the collar -20 for grindin I the whole or the greater part of the length of a shear blade in one operation.

Okz'sel holder.

The upright extension 70- of the bracket -62-- is also provided with a transverse guide opening or slot 72- for receiving theblade of a chisel C, said guide opening or slot -72-- bein disposed at an angle to the adjacent end ace of the grinder -18- corresponding to the angle at which the cutting edge of the chisel is to be ground.

When it is desired to grind the cutting edge of the chisel, the cutting end of the blade is inserted through the slot -72 to brin its cutting edge against the adjacent end "ace of the grinder where it is held by hand until brought to the desired finish.

It will be evident from the foregoing descriptions that these various work holders are arranged in definite relation to the grinder or to the axis of rotation thereof and are also arranged in definite relation to each other so that either may be used for its particular work without interfering with the other holders, thus making it possible for several operators to use the same stone at the same time. For example, one operator might be grinding valves, another 0 erator so that the trueing wheel 48- may be caused to sweep across the face of the grinder without interfering with any of the other operations.

Operation.

This rotation of the gear 14- will impart a rotary motion to the shaft 29 Figure 4, through the medium of the pmlon 30 meshing therewith, which rotary motion will be again transmitted to the upright shaft --25 Figure 5, through the medium of the worm -3l and gear 28 and thence through the worm 39- and gear -38. tothe work holder in which the work, such for example as the valve a, is held and rotated against the'outer end face of the grindstone.

The angle of contact of the work in the holder 35 relatively to the grinding face of the grinder --18 may be changedsat will by simply adjusting the bearing 32- about the axis of the shaft 25.

The trueing device may be operated by hand through the medium of the handle 56- across the adjacent end face of the grinder whenever it is necessary to true said face but may be withdrawn from contact with the grinder by simply loosening the adjusting screw 55-.

.Ln grinding the cutting point of the drill the latter is simply laid lengthwise in the groove 59-- of the support 58 with the point facing the adjacent end of the grinder after which it may be adjusted to contact with the grinder by means of the screw --63 engaging the end' of the shank of the drill, said drill being rotated by hand to cause all portions of its point to be ground to the same bevel or angle.

Various articles not necessary to herein illustrate or describe may be supported upon the beveled upper face of the bracket 62- c to contact with the periphery of the grinder for grinding purposes.

In grinding shears, the blade is held flatwise against the beveled face -71-- with its cutting edge against the adjacent end face of the grinder and is then moved endwise as may be required to impart the desired finish to the cutting of the blade.

In grinding a chisel the blade of the latter is inserted through the slot 72-- with its cutting edge against the inner face of the grinder to impart the necessary finishthereto.

What I claim is 1. In a grinding machine of the character described, a gear case, a horizontal driving shaft journaled in the gear case, means for rotating said shaft, separate driven shafts journaled in the gear case parallel with the driving shaft, gearing within said case for transmitting rotary motion from the driving shaft to both of the driven shafts, a

' grinding wheel secured to one of the driven shafts, a bracket mounted on the gear case, an upright shaft journaled on said bracket,

means for transmitting rotary motion from the other driven shaft to the upright shaft, a horizontal bearing member mounted on the bracket for angular adjustment about the axis of the upright shaft, a rotary Workholder ournaled on said bearing member at one side of the axis of the upright shaft, and means for transmitting rotary motion from theupright shaft to the work-holder.

2. In a grinding machine of the character descr bed, a rotary driving shaft, means for rotating said shaft, a relatively large gear secured to the driving shaft, separate rotary driven shafts parallel with the driving shaft and provided with pinions meshing with said gear, a grinding wheel secured to one of said driven shafts, a rotary work-holder, and means for transmitting rotary motion from the other driven shaft to said workholder.

Y 3. In a grinding machine of the character described, a gear case, a driving shaft journaled on the gear case,*means for rotating said shaft, separate driven shafts journaled on the gear case, means for transmitting rotary motion from the driving shaft to both of the driven shafts, a grinding wheel secured to one of the driven shafts, a bracket mounted on the gear case, an additional shaft journaled on the bracket, means for transmitting rotary motion from the other driven shaft to said additional shaft, a bearing member mounted on the bracket, a rotary work-holder journaled in the bearing member, and means for transmitting rotary motion from said additional shaft to the workholder.

p 4. In a grinding machine of the character described, a gear case, a driving shaft journaled on the gear case, means .for rotating said shaft, separate driven shafts journaled on the gear case, means for transmitting rotary motion from the driving shaft to both of the driven shafts, a grinding wheel secured to one of the driven shafts, a bracket mounted on the gear case, an additional shaft journaled on the bracket, means for transmitting rotary motion from the other driven shaft to said additional shaft, a hearing member mounted on the bracket, a r0- tary work-holder journaled in the bearing member, and means for transmitting rotary motion from said additional shaft to the work-holder, said bracket and parts carried thereby being adjustable about the axis of the second-named driven shaft to accommodate the work-holder to grinding wheels of different diameters.

In witness whereof I have hereunto set my hand this 17th day of January, 1925.

JAMES HENRY LITTLER. 

